This project was designed to be distribution independent; that's in theory. In practice today it is tied to both ostree and rpm (though the rpm part is definitely written in an attempted-to-be pluggable way).

But I think it will make more sense to fold this into https://github.com/containers/bootc - we're not going to have non-ostree support anytime soon, and if we do it should work in the same way as bootc. Also, I think we want bootc bootloader update e.g.

Also, the two projects are similarly named and it will be less confusing to just have bootc, not bootc and bootupd.